Among the red canister variety of gelatin, there are yet even more decisions to be made! You have two options: kosher or porcine. Kosher meaning, pig-free and from cows only, and porcine which is primarily from pig parts (hide and bones).
A parallel port is an interface allowing a personal computer (PC) to transmit or receive data down multiple bundled cables to a peripheral device such as a printer. The most common parallel port is a printer port known as the Centronics port.
If you wish to use your Bi-directional port to input data, test it with a logic probe or multimeter first to make sure it is in bi-directional mode. If your Parallel Port doesn't support bi-directional mode, don't despair. You can input a maximum of 9 bits at any one given time. To do this you can use the 5 input lines of the Status Port and the 4 inputs (open collector) lines of the Control Port.